Articles – Studiopieters

Guides Everything You Need to Know About the LD33V A fixed 3.3V linear regulator from the LD1117 family, the go-to way to power ESP modules, sensors and RF radios from a higher unregulated input. This guide covers dropout voltage, required capacitors, power dissipation, and how to avoid the overheating and brownout problems that come with powering an ESP32 from one. Read more

Guides 1.28-Inch GC9A01 Round TFT Display: Complete Guide The 1.28-inch GC9A01 is a small round color display with 240 x 240 pixels and a simple SPI connection. It is popular for gauges, watch faces and robot eyes. This guide covers the pinout, wiring to an ESP32, two code examples and the limits you should know. Read more

Guides The Complete Guide to the HC-SR501 PIR Motion Sensor The pin reference for the HC-SR501 PIR motion sensor: VCC, OUT and GND, with labeled diagrams of both sides, the dimensions, the settings explained and the traps that cause false triggers. Read more

Guides 2.25 inch TFT LCD ST7789 SPI Display A compact 128 x 400 IPS display driven by the ST7789 controller over a 4-wire SPI bus. This guide covers the pinout, ESP32 wiring, and Arduino code using the Adafruit ST7789 library. Read more

Guides The Complete Guide to the BH1750 Digital Light Sensor The BH1750 digital ambient light sensor: real specifications from the ROHM datasheet, pins, I2C addresses, all modes and commands, very bright and very dark light, code and the traps that give wrong lux values. Read more

HomeKit ESP32 HomeKit Sunshade with Calibration and Weather Protection A HomeKit Window Covering accessory for the ESP32 that replaces an up, down and stop switch, with touch buttons, calibration, power-loss recovery and optional wind, rain and light protection. Read more

Guides The Ultimate Guide to the SHT Sensor Series Sensirion's SHT2x/3x/4x family are factory-calibrated I2C temperature and humidity sensors with low drift and fast response. This guide compares the three series, covers wiring an SHT31 to an ESP32, and helps pick the right model for accuracy, power budget or outdoor use. Read more